// Copyright (C) 2013 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.gerrit.acceptance.rest.project;

import static com.google.gerrit.acceptance.GitUtil.createProject;
import static com.google.gerrit.acceptance.rest.project.BranchAssert.assertBranches;
import static com.google.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS;
import static com.google.gerrit.server.project.Util.block;
import static org.junit.Assert.assertEquals;

import com.google.common.collect.Lists;
import com.google.gerrit.acceptance.AbstractDaemonTest;
import com.google.gerrit.acceptance.PushOneCommit;
import com.google.gerrit.acceptance.RestResponse;
import com.google.gerrit.common.data.Permission;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.server.git.MetaDataUpdate;
import com.google.gerrit.server.git.ProjectConfig;
import com.google.gerrit.server.project.ListBranches.BranchInfo;
import com.google.gerrit.server.project.ProjectCache;
import com.google.gson.reflect.TypeToken;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;

import com.jcraft.jsch.JSchException;

import org.apache.http.HttpStatus;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.errors.RepositoryNotFoundException;
import org.junit.Test;

import java.io.IOException;
import java.util.Collections;
import java.util.List;

public class ListBranchesIT extends AbstractDaemonTest {

  @Inject
  private MetaDataUpdate.Server metaDataUpdateFactory;

  @Inject
  private ProjectCache projectCache;

  @Test
  public void listBranchesOfNonExistingProject_NotFound() throws IOException {
    assertEquals(HttpStatus.SC_NOT_FOUND,
        GET("/projects/non-existing/branches").getStatusCode());
  }

  @Test
  public void listBranchesOfNonVisibleProject_NotFound() throws IOException,
      OrmException, JSchException, ConfigInvalidException {
    blockRead(project, "refs/*");
    assertEquals(HttpStatus.SC_NOT_FOUND,
        userSession.get("/projects/" + project.get() + "/branches").getStatusCode());
  }

  @Test
  public void listBranchesOfEmptyProject() throws IOException, JSchException {
    Project.NameKey emptyProject = new Project.NameKey("empty");
    createProject(sshSession, emptyProject.get(), null, false);
    RestResponse r = adminSession.get("/projects/" + emptyProject.get() + "/branches");
    List<BranchInfo> expected = Lists.asList(
        new BranchInfo("refs/meta/config",  null, false),
        new BranchInfo[] {
          new BranchInfo("HEAD", null, false)
        });
    assertBranches(expected, toBranchInfoList(r));
  }

  @Test
  public void listBranches() throws IOException, GitAPIException {
    pushTo("refs/heads/master");
    String masterCommit = git.getRepository().getRef("master").getTarget().getObjectId().getName();
    pushTo("refs/heads/dev");
    String devCommit = git.getRepository().getRef("master").getTarget().getObjectId().getName();
    RestResponse r = adminSession.get("/projects/" + project.get() + "/branches");
    List<BranchInfo> expected = Lists.asList(
        new BranchInfo("refs/meta/config",  null, false),
        new BranchInfo[] {
          new BranchInfo("HEAD", "master", false),
          new BranchInfo("refs/heads/master", masterCommit, false),
          new BranchInfo("refs/heads/dev", devCommit, true)
        });
    List<BranchInfo> result = toBranchInfoList(r);
    assertBranches(expected, result);

    // verify correct sorting
    assertEquals("HEAD", result.get(0).ref);
    assertEquals("refs/meta/config", result.get(1).ref);
    assertEquals("refs/heads/dev", result.get(2).ref);
    assertEquals("refs/heads/master", result.get(3).ref);
  }

  @Test
  public void listBranchesSomeHidden() throws IOException, GitAPIException,
      ConfigInvalidException, OrmException, JSchException {
    blockRead(project, "refs/heads/dev");
    pushTo("refs/heads/master");
    String masterCommit = git.getRepository().getRef("master").getTarget().getObjectId().getName();
    pushTo("refs/heads/dev");
    RestResponse r = userSession.get("/projects/" + project.get() + "/branches");
    // refs/meta/config is hidden since user is no project owner
    List<BranchInfo> expected = Lists.asList(
        new BranchInfo("HEAD", "master", false),
        new BranchInfo[] {
          new BranchInfo("refs/heads/master", masterCommit, false),
        });
    assertBranches(expected, toBranchInfoList(r));
  }

  @Test
  public void listBranchesHeadHidden() throws IOException, GitAPIException,
      ConfigInvalidException, OrmException, JSchException {
    blockRead(project, "refs/heads/master");
    pushTo("refs/heads/master");
    pushTo("refs/heads/dev");
    String devCommit = git.getRepository().getRef("master").getTarget().getObjectId().getName();
    RestResponse r = userSession.get("/projects/" + project.get() + "/branches");
    // refs/meta/config is hidden since user is no project owner
    assertBranches(Collections.singletonList(new BranchInfo("refs/heads/dev",
        devCommit, false)), toBranchInfoList(r));
  }

  private RestResponse GET(String endpoint) throws IOException {
    return adminSession.get(endpoint);
  }

  private void blockRead(Project.NameKey project, String ref)
      throws RepositoryNotFoundException, IOException, ConfigInvalidException {
    ProjectConfig cfg = projectCache.checkedGet(project).getConfig();
    block(cfg, Permission.READ, REGISTERED_USERS, ref);
    saveProjectConfig(project, cfg);
    projectCache.evict(cfg.getProject());
  }

  private static List<BranchInfo> toBranchInfoList(RestResponse r)
      throws IOException {
    List<BranchInfo> result =
        newGson().fromJson(r.getReader(),
            new TypeToken<List<BranchInfo>>() {}.getType());
    return result;
  }

  private PushOneCommit.Result pushTo(String ref) throws GitAPIException,
      IOException {
    PushOneCommit push = pushFactory.create(db, admin.getIdent());
    return push.to(git, ref);
  }

  private void saveProjectConfig(Project.NameKey p, ProjectConfig cfg) throws IOException {
    MetaDataUpdate md = metaDataUpdateFactory.create(p);
    try {
      cfg.commit(md);
    } finally {
      md.close();
    }
  }
}